除了在查询构建器中使用distinct方法,我们还可以在Eloquent模型中使用distinct方法。下面是一个示例: 代码语言:txt 复制class User extends Model { public function scopeDistinctName($query) { return $query->distinct('name'); } } $users = User::distinctName()->get(); 在上面的示例中,我们定义了一个...
Eloquent will also assume that each table has a primary key column namedid. You may define a$primaryKeyproperty to override this convention. Eloquent 假定每一个数据表中都存在一个命名为id的列作为主键。你可以通过定义一个$primaryKey属性来明确指定一个主键。 时间戳 默认情况下,Eloquent 期望数据表中...
The above example will make a single database query, retrieve all the records from the table, and hydrate Eloquent models one by one. This approach will make only one database query to retrieve all the posts. But usesphp generatorto optimize the memory usage. when can you use this? Though...
* @return \Illuminate\Database\Eloquent\Model|\Illuminate\Database\Eloquent\Collection|static[]|static|null */ public function find($id, $columns = ['*']) { if (is_array($id) || $id instanceof Arrayable) { return $this->findMany($id, $columns); } return $this->whereKey($id)->...
The role_user table is derived from the alphabetical order of the related model names, and should have user_id and role_id columns.We can define a many-to-many relation using the belongsToMany method:1class User extends Eloquent { 2 3 public function roles() 4 { 5 return $this->...
By default, Eloquent expects created_at and updated_at columns to exist on your tables. If you do not wish to have these columns automatically managed by Eloquent, set the $timestamps property on your model to false: 默认情况下,在你的表中存在created_at 和 updated_at两列。如果不想自动管理...
By default, Eloquent will maintain the created_at and updated_at columns on your database table automatically. Simply add these timestamp columns to your table and Eloquent will take care of the rest. If you do not wish for Eloquent to maintain these columns, add the following property to ...
Instead of manually specifying the value of each column, Laravel allows you to define a set of default attributes for each of your Eloquent models using model factories.To see an example of how to write a factory, take a look at the database/factories/UserFactory.php file in your ...
当我试图求和超过1个“价格”列数据时遇到问题,这些数据已经被一个或多个条件过滤。我已经成功地用多个条件过滤了数据并成功地列出了它。但当我尝试对“价格”求和时,过滤器仍然正常工作并列出了数据,但不会返回“价格”列的总和数据。 从网上我得到了总结的信息,专栏如下 ...
class Show extends Eloquent { public function users() { return $this->belongsToMany ('User'); } } 6. Make a route in routes.php to add a new user and attach two shows: Route::get('add-show',function() {$user=newUser();$user->username = 'John Doe';$user->email = 'johndoe...